20a. Stamens 5 (leaves mostly basal; flowers greenish or purplish in late spring, on stalks 5-10 dm. high) (Alum Root) --21. 20b. Stamens 10 (flowers white, in spring) --23. 21a. Flowers regular =Alum Root, Heuchera americana.= 21b. Flowers irregular, the calyx oblique, longer on the upper side than on the lower --22. 22a. Stamens projecting beyond the calyx =Alum Root, Heuchera hirsuticaulis.= 22b. Stamens not projecting beyond the calyx =Alum Root, Heuchera hispida.= 23a. Stem-leaves alternate or none --24. 23b. Stem with a pair of opposite leaves (2-4 dm. high) =Bishop's Cap, Mitella diphylla.= 24a. Petals deeply fringed (1-2 dm. high) =Bishop's Cap, Mitella nuda.= 24b. Petals entire (1-3 dm. high) =False Mitrewort, Tiarella cordifolia.= HAMAMELIDACEAE, the Witch Hazel Family Shrubs, with alternate simple leaves; sepals, petals, and stamens each 4; ovary 2-lobed. One species in Michigan; tall shrub with obovate leaves and yellow flowers appearing late in autumn =Witch Hazel, Hamamelis virginiana.= PLATANACEAE, the Plane Tree Family Trees, with broad, palmately veined and lobed leaves, and minute flowers in dense spherical heads. One species in Michigan =Sycamore, Platanus occidentalis.= ROSACEAE, the Rose Family Trees, herbs, or shrubs, with alternate, frequently compound leaves; petals and sepals usually 5, stamens numerous, pistils 1 to many; receptacle expanded into a saucer-shape or cup-shape organ, bearing the sepals, petals, and stamens at its margin, the pistils at its center, and resembling a calyx-tube or flattened calyx. 1a. Shrubs or trees --2. 1b. Herbaceous plants --48. 2a. Leaves compound --3. 2b. Leaves simple --24. 3a. Flowers in large panicles or corymbs, each flower 5-10 mm. across; leaflets 7 or more --4. 3b. Flowers solitary or in small clusters, each flower usually 20-80 mm. wide; leaflets frequently only 3 or 5 --7. 4a. Flowers in a pyramidal or oblong panicle, the ovaries superior (1-2 m. high; flowers white, in summer) --70b. 4b. Flowers in rounded or hemispheric clusters, the ovary inferior --5. 5a. Leaves pubescent on the lower surface =Rowan Tree, Pyrus aucuparia.= 5b. Leaves glabrous beneath when mature (small trees; flowers white, in early summer or late spring) (Mountain Ash) --6. 6a. Leaves acuminate at the apex =Mountain Ash, Pyrus americana.= 6b. Leaves obtuse or acute at the apex =Mountain Ash, Pyrus sitchensis.= 7a. Flowers yellow (5-10 dm. high; summer) =Cinquefoil, Potentilla fruticosa.=